Hitachi H8S/2646 Hardware Manual page 89

Figure 2-12 shows examples of instruction formats.
(1) Operation field only
(2) Operation field and register fields
(3) Operation field, register fields, and effective address extension
(4) Operation field, effective address extension, and condition field
op
op
op
op
EA (disp)
cc
Figure 2-12 Instruction Formats (Examples)
rm
rn
rn rm
EA (disp)
NOP, RTS, etc.
ADD.B Rn, Rm, etc.
MOV.B @(d:16, Rn), Rm, etc.
BRA d:16, etc
57